The Onset of Chromospheres in A-Type Stars - the ALTAIR Affair
Abstract
Here we present preliminary results on the study of the chromosphere of Altair from L high dispersion profiles. We report also the detection of L chromospheric emission from Cep (A7 V) and TrA (F0 V) with the ME. We show that chromosphere may exist up to B - V = 0.22. The possible heating mechanism, magnetic or nonmagnetic, for the chromosphere of these stars is also discussed.
- Publication:
-
IAU Colloq. 130: The Sun and Cool Stars. Activity, Magnetism, Dynamos
- Pub Date:
- 1991
- DOI:
- 10.1007/3-540-53955-7_181
- Bibcode:
- 1991LNP...380..466C